CN103728071B - A kind of fired power generating unit maximum output measuring method - Google Patents
A kind of fired power generating unit maximum output measuring method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003245 coal Substances 0.000 claims abstract description 55
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 238000004364 calculation method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
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- 239000000428 dust Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012804 iterative process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- 239000002893 slag Substances 0.000 description 1
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Abstract
The invention discloses a kind of fired power generating unit maximum output measuring method, according to the actual as-fired coal matter of power plant, consider pulverized coal preparation system and to exert oneself change, in conjunction with turbine efficiency curve, determine to go out force level under actual as-fired coal matter achieved by unit.When the present invention can help power plant's scientific explarnation burning inferior coal, the basic reason that unit output is limited, and facilitate power plant to dispatch according to network load, adjust as-fired coal matter in advance, ensure unit on-load ability.
Description
Technical field
The present invention relates to thermal engineering technical field, particularly under a kind of different ature of coal, fired power generating unit goes out force measuring method.
Background technology
Because coal reserves is less and based on lambskin, soft coal, coal input is subject to several factors restriction, Hunan Province's Large-scale fire-electricity unit boiler uses lambskin or the soft coal of non dipper in a large number, ash content is high, calorific value is low, volatile matter is low, grindability is poor, and mix in coal source, ature of coal fluctuation is large.These result in Hunan Province's Large-scale fire-electricity unit boiler efficiency compared with low, equipment failure is many, non-ly stop differently stopping taking place frequently, unit output fluctuation etc.The fluctuation of boiler parameter is on the impact of steam turbine, and system coordination ability is more weak, has increased the weight of the impact of unstable combustion on unit output.
Station boiler, when especially opposed firing Boilers of Supercritical Parameters uses lambskin, the stability of unit output and burning, economy are all the contents needing research.There is not yet the theoretical research under using lambskin, unit output affected both at home and abroad, this achievement in research unit load when using lambskin that can be coupled is exerted oneself limited resource (pulverized coal preparation system is exerted oneself, as-fired coal gross thermal value, boiler efficiency, feed temperature etc.), provides and improves unit output solution.Studied by project, when using lambskin, pulverized coal preparation system is exerted oneself ensures it is the basic direction of guaranteeing unit output, and pulverized coal preparation system is exerted oneself relevant to coal pulverizer ventilation (to the ball type pulverizer system) and primary air pressure (unit pulverized-coal system), steel ball loading capacity, steel ball matching etc.; Improving as-fired coal calorific value is the important method guaranteeing unit output, and rationally mixing formula formula and mixture proportion etc. is important method, by improving boiler efficiency, also can improve fired power generating unit on-load ability.Improve boiler efficiency, answer overheavy firing to adjust, guarantee best fineness of pulverized coal, carry out optimization air distribution, reduce ash combustibles and exhaust gas temperature etc.
Coal-fired station is under different ature of coal, and unit on-load ability exists significant difference, how scientific explarnation and the unit output ability under the different coal-fired ature of coal of prediction be power plant in the urgent need to technology.
Summary of the invention
Technical matters to be solved by this invention is; not enough for prior art, provide a kind of fired power generating unit maximum output measuring method, scientific explarnation and the unit output ability under the different coal-fired ature of coal of prediction; guarantee that unit adapts to network load demand, and do not waste high-quality fire coal.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of fired power generating unit maximum output measuring method, and the method is:
1) the boiler efficiency η gl of fired power generating unit under current ature of coal is measured; Measure as-fired coal net calorific value Qnet, ar; Measure fired power generating unit pipeline efficiency eta gd and efficiency of generator η fdj;
2) using fired power generating unit rated power P ' as calculated load, rated power P ' lower fired power generating unit turbine efficiency η qj is recorded;
3) fired power generating unit realtime power P is calculated according to following formula:
P=Qsr×ηgl×ηgd×ηqj×ηfdj；
Wherein, Qsr is thermal power unit boiler input heat, and Qsr=Bm × Qnet, ar, Bm are that Ball Mill Pulverizer System is exerted oneself;
4) if (P '-P)/P ' > 5%, then using realtime power P as calculated load, record fired power generating unit turbine efficiency η qj under realtime power P, return step 2); Otherwise, take realtime power P as the maximum output of fired power generating unit under current ature of coal.
In described step 1), as-fired coal net calorific value Qnet, ar adopt calorimeter to record.
In described step 1), described as-fired coal net calorific value Qnet, ar span is 13000kJ/kg ~ 25000kJ/kg; Described pipeline efficiency eta gd >=97%; Efficiency of generator η fdj >=99%.
Described pipeline efficiency eta gd is 99%; Efficiency of generator η fdj is 99%.
In described step 3), pulverized coal preparation system Bm span of exerting oneself is 30t/h ~ 70t/h.
Compared with prior art, the beneficial effect that the present invention has is: the iterative computation model that the invention provides unit output under a kind of different ature of coal, the convenient realtime power calculating fired power generating unit; Method of the present invention can unit output ability under scientific explarnation and the different coal-fired ature of coal of prediction, facilitates power plant to dispatch according to network load, adjusts as-fired coal matter in advance, guarantee that unit adapts to network load demand, and do not waste high-quality fire coal.
Accompanying drawing explanation
Fig. 1 is one embodiment of the invention method flow diagram.
Embodiment
From thermal power generation process, fire coal enters boiler, through boiler conversion, be heat energy by chemical energy, steam is entered steam turbine, be mechanical energy by thermal energy, steam turbine rotates cutting magnetic line, and changes mechanical energy is electric energy, here in process, the loss of following several link is there is: boiler efficiency, pipeline efficiency, steam turbine efficiency, efficiency of generator, the invention provides the computation model of fired power generating unit realtime power P in the conversion of energy:
P=Qsr×ηgl×ηgd×ηqj×ηfdj（1）
In above formula, Qsr is boiler input heat (Q=Bm × Qnet, ar), and Bm is that pulverized coal preparation system is exerted oneself (or coal dust input quantity, directly to convert acquisition by Power Plant DCS data, accurate data goes out Force meansurement by pulverized coal preparation system and realizes, and pulverized coal preparation system is exerted oneself according to pulverized coal preparation system operation conditions, and normal range is 30t/h ~ 70t/h, this place), Qnet, ar are as-fired coal net calorific value, record (normal range is generally 13000kJ/kg ~ 25000kJ/kg) in laboratory with calorimeter; η gl is boiler efficiency, larger by effect on coal quality, little by loading effects, under different ature of coal, boiler efficiency can obtain (by measuring exhaust gas temperature, oxygen content in exhaust gas by test in advance, obtain flying dust sample, slag sample, pulverized coal sample, raw coal sample etc., carry out test according to GB10184-88 " station boiler performance test code " and obtain efficiency); η gd, η fdj are respectively pipeline efficiency and efficiency of generator, can be considered constant, and all can be taken as 99%(pipeline efficiency minimum about 97%, efficiency of generator is not less than 99%).η qj is turbine efficiency, with running environment (environment temperature, vacuum etc.) and unit load closely related, when normally running, can think that turbine efficiency is the function of unit load, this function or relation provide steam turbine performance characteristic curve to obtain by steam turbine producer or test obtains (under different load, carrying out turbine thermodynamic efficiency according to GB/T8117.2 – 2008/IEC60953-2:1990 " steam turbine performance reception test code ").
From formula (1), the key link affecting unit output is input heat, boiler efficiency and steam turbine efficiency.Under steam turbine operation normal condition, its thermal efficiency is the function of unit load.
When determining unit maximum output under burning environment of inferior quality coal condition, first using (rated power) at full capacity as initial calculation point, obtain tubine efficiency at full capacity, solve by formula (1), the unit realtime power calculated and initial value (rated power) deviation do not meet the demands then descending iterative, iterative step-length is that △ P(substitutes into calculating by 1000 kilowatts), until both differences meet calculation requirement.Concrete iterative process is shown in Fig. 1.
Embodiment:
The construction of electricity Baoqing, Hunan Mei electricity company limited of state has 2 600MW supercritical parameter face-fired boilers, and designing coal-fired net calorific value is 20300kJ/kg, and in actual motion, it is about 17500kJ/kg that power plant commonly uses coal-fired ature of coal.The turbine efficiency curve display that power plant provides, tubine efficiency is 45.6% at full capacity, according to computation model of the present invention, calculate, actual Coal-fired capacity gets final product maximum output (660MW) to run when can reach 323t/h, in actual motion, 6 coal pulverizers add up to provides 325t/h coal supply per hour, and set steady goes out force level at 660MW.Result of calculation and reality are coincide good.
Therefore computation model of the present invention and computing method can better instruct power plant to predict the maximum output that unit can obtain under different ature of coal in advance.
Claims (5)
1. a fired power generating unit maximum output measuring method, is characterized in that, the method is:
1) the boiler efficiency η gl of fired power generating unit under current ature of coal is measured; Measure as-fired coal net calorific value Qnet, ar; Measure fired power generating unit pipeline efficiency eta gd and efficiency of generator η fdj;
2) using fired power generating unit rated power P ' as calculated load, rated power P ' lower fired power generating unit turbine efficiency η qj is recorded;
3) fired power generating unit realtime power P is calculated according to following formula:
P=Qsr×ηgl×ηgd×ηqj×ηfdj；
Wherein, Qsr is thermal power unit boiler input heat hourly, and Qsr=Bm × Qnet, ar, Bm are that Ball Mill Pulverizer System is exerted oneself;
4) if (P '-P)/P ' > 5%, then using realtime power P as calculated load, record fired power generating unit turbine efficiency η qj under realtime power P, return step 2); Otherwise, take realtime power P as the maximum output of fired power generating unit under current ature of coal.
2. fired power generating unit maximum output measuring method according to claim 1, is characterized in that, in described step 1), as-fired coal net calorific value Qnet, ar adopt calorimeter to record.
3. fired power generating unit maximum output measuring method according to claim 1 and 2, is characterized in that, in described step 1), described as-fired coal net calorific value Qnet, ar span is 13000kJ/kg ~ 25000kJ/kg; Described pipeline efficiency eta gd >=97%; Efficiency of generator η fdj >=99%.
4. fired power generating unit maximum output measuring method according to claim 3, is characterized in that, described pipeline efficiency eta gd is 99%; Efficiency of generator η fdj is 99%.
5. fired power generating unit maximum output measuring method according to claim 1, is characterized in that, in described step 3), pulverized coal preparation system Bm span of exerting oneself is 30t/h ~ 70t/h.
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| CN107895972B (en) * | 2017-11-30 | 2021-03-16 | 广东电网有限责任公司电力调度控制中心 | Thermal power unit load capacity assessment method and system |
| CN108361080A (en) * | 2018-02-28 | 2018-08-03 | 华电电力科学研究院有限公司 | System exception leads to the analysis method that steam turbine on-load ability declines |
| CN110518640B (en) * | 2019-09-05 | 2021-04-27 | 华北电力科学研究院有限责任公司 | Thermal power generating unit load response state evaluation method and device |
| CN110633903B (en) * | 2019-09-05 | 2022-07-05 | 华北电力科学研究院有限责任公司 | Thermal power generating unit load response evaluation method and device |
| CN112348268B (en) * | 2020-11-11 | 2023-05-02 | 国网山东省电力公司电力科学研究院 | Method and system for evaluating maximum output of thermal power unit in real time based on coal quantity data |
| CN114281129B (en) * | 2021-12-28 | 2022-09-13 | 国网湖南省电力有限公司 | Control method and system for active support type energy storage power station temperature control system |
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| CN101799848A (en) * | 2010-03-09 | 2010-08-11 | 江西省电力科学研究院 | Method for obtaining energy loss analysis parameter answer value of furnace of thermal power set |
| CN101865867A (en) * | 2010-06-21 | 2010-10-20 | 西安热工研究院有限公司 | Method for calculating coal elements and industrial components in real time |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5067355A (en) * | 1990-07-13 | 1991-11-26 | General Electric Company | Shaft torque measurement |
| CN1581151A (en) * | 2004-05-09 | 2005-02-16 | 上海电力学院 | On-line analysing-monitoring system for heat-engine plant pipeline heat-efficiency |
| CN101504243A (en) * | 2008-11-26 | 2009-08-12 | 刘福军 | Condensing liquid nitrogen deep-cooling process for turbine |
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